标题： μ子g-2实验在费米实验室 显示英文标题

标题： Muon g-2 Experiment at Fermilab

摘要： 在费米实验室进行的新实验将用140十亿分之一（ppb）的精度测量缪子的异常磁矩。 这一测量是受布鲁克黑文E821实验结果的推动，这些结果是在十多年前首次发布的，达到了540 ppb的精度。 随着相应的标准模型预测得到改进，实验和理论值之间一直存在大约3个标准差的差异。 如果在费米实验室以这种提高的精度确认布鲁克黑文的结果，这将构成超出标准模型的物理现象的决定性证据。 该实验观察飞行中缪子自旋进动频率，在一个校准良好的磁场中；精度的提高将需要记录的缪子衰变事件数量是E821实验的20倍，并且系统不确定度要减少3倍。 本文描述了当前的实验状态以及为2017年开始束流数据采集而准备的升级磁铁、探测器和存储环系统的计划。 显示英文摘要

摘要： A new experiment at Fermilab will measure the anomalous magnetic moment of the muon with a precision of 140 parts per billion (ppb). This measurement is motivated by the results of the Brookhaven E821 experiment that were first released more than a decade ago, which reached a precision of 540 ppb. As the corresponding Standard Model predictions have been refined, the experimental and theoretical values have persistently differed by about 3 standard deviations. If the Brookhaven result is confirmed at Fermilab with this improved precision, it will constitute definitive evidence for physics beyond the Standard Model. The experiment observes the muon spin precession frequency in flight in a well-calibrated magnetic field; the improvement in precision will require both 20 times as many recorded muon decay events as in E821 and a reduction by a factor of 3 in the systematic uncertainties. This paper describes the current experimental status as well as the plans for the upgraded magnet, detector and storage ring systems that are being prepared for the start of beam data collection in 2017.